posted on Mar, 22 2011 @ 12:18 PM
I started looking up this term 'ducting', hearing as how it is being used by experts to explain away the sound. But what is ducting? Whistler
Ducting is the ability for very low frequency waves caused by ______ , to travel through the atmosphere when conditions are perfect [read:
irregularities are present] in the Ionosphere and Magnetosphere.
Firstly, what exactly are ducts?
Atmospheric ducting is a mode of propagation of electromagnetic radiation, usually in the lower layers of Earth’s atmosphere, where the waves are
bent by atmospheric refraction...
...The reduced refractive index due to lower densities at the higher altitudes in the Earth's atmosphere bends the signals back toward the Earth.
Signals in a higher refractive index layer, i.e., duct, tend to remain in that layer because of the reflection and refraction encountered at the
boundary with a lower refractive index material. In some weather conditions, such as inversion layers, density changes so rapidly that waves are
guided around the curvature of the earth at constant altitude..Source:Wikipedia
So can humans use them for wave propagation?
Whistlers aren't utilities, or man-made signals at all, but they're interesting. These audio-frequency electrical sweeps are believed to be
generated by distant lightning interacting with the ionosphere. They are best heard by special direct-conversion receivers, though a standard audio
amp will work if noise permits, which it usually doesn't. Whistlers are spooky. Something like 10 different sweeps are visible in this unusually
large one. Notice how the amplitude builds as they kick in, then drop off. Several university professors have made very good recordings of whistlers
and other atmospheric electrical phenomena, and these are available online. Source: Ionospheric
Yet in 1972 there were classified theories on their generation by the military?
Magnetospheric ducts that guide very-low-frequency (VLF) radiation are subject to spontaneous intensification by a linear instability that arises from
the coupling between the magnetosphere and the ionosphere. The elements of this instability comprise a localized enhancement of electron precipitation
and a field-aligned column of enhanced plasma density, each in turn causing the other. This interaction can create fully developed plasmapheric ducts
spontaneously from infinitesimal fluctuations. A whistler duct thus formed attains saturation (nonlinear stabilization) by virtue of ionospheric
recombination and the bounded supply of electrons available for precipitation. (Author)
And in 2005 it is observed that Very Low Frequency waves propagate easily through them. So, if we can create an irregularity in the
ionosphere/magnetosphere, we should be able to direct propagation of VLF waves?
The propagation of electromagnetic waves through the ionosphere in the presence of irregularities is differently affected in different frequency
ranges. Very high frequency waves are scattered whereas very low frequency waves are guided through the ducts formed by the irregularities under
Source: Scintillation Producing and Whistler Ducting Ionospheric
So, what was it that HAARP does again? Wouldn't 'exciting' the ionosphere cause any irregularities?
The Ionospheric Research Instrument (IRI), a high power transmitter facility operating in the High Frequency (HF) range. The IRI will be used to
temporarily excite a limited area of the ionosphere for scientific study. Source: HAARP
Now that it is excited, can we generate VLF waves somehow and use them for geophysical surveying?
ELF/VLF radio waves penetrate deeply beneath the surface of the earth and interact with the geologic structure of the earth. This interaction induces
secondary fields with measurable effect at and above the surface of the earth. Proper understanding of the physics of the generation and
propagation of ELF/VLF waves and their interactions with earth materials will allow these waves to be used for applications such as sub-surface
communications and exploration of the subsurface geological structure. The research called for under this effort is to assess the viability of
exploiting the concept of electromagnetic induction to detect and image subterranean features such as tunnels, bunkers, and other potential military
Several distinct methods for ELF/VLF generation are available to support these efforts. Proposers are encouraged to consider including the
controlled ELF/VLF sources provided by the 960KW HF transmitter of the HAARP, presently under construction outside Gakona, Alaska and the HIPAS
facility located near Fairbanks, Alaska. PL/GPS is the program manager for the HAARP facility. The Office of Naval Research controls the HIPAS
facility. Both sites will be available to support the research efforts under this PRDA. Source:
Federation of American Scientists
Now for the ATS grade conspiracy: If Russians are warning of a pending continental movement, would it not make sense for us to use the tools at our
disposal to take a survey of the deep earth? Could the sounds people are hearing be ducted VLF waves aimed at surveying the continent for structural
Just throwing it out there...